I did a nice circular walk from Dufton which involved following the Pennine Way out of Dufton and going up Great Rundale. There's a path of sorts from Great Rundale Tarn following the beck which brings you out above High Cup, then you can follow the pw route back, or scramble down to the bottom and walk out that way. When I did it, it was about this time of year, and the flowers were really good, lots of birds eye primroses in the valley, and an assortment of limestone flowers in a gorge just before you reach High Cup. I reckon approaching it from the top gives the best 'Wow' moment, especially if it's the first time you've seen it.